Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4cf930e78822241…

MALICIOUS

PDF

139.4 KB Created: 2021-07-16 20:12:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 0f99caacb769b465b3b0c70d620ffef2 SHA-1: 307687713e1e1a2d3454b3dc6222dc88c9ffdbcb SHA-256: f4cf930e7882224103ad9783de09ade848882df1a62ed9b49aa42ed1f9f8cc72
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting. These links likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9733

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/irk0m1jhpf43884va6ulal2iqm/magim.pdf In PDF document text
    • https://ttnthailand.com/upload/userfile/files/limen.pdfIn PDF document text
    • http://www.houstonorientalrug.com/ckfinder/userfiles/files/33009773263.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/tasunoxot.pdfIn PDF document text
    • http://bbgannualseminar.com/clients/6/60/607ac775fa755cf068047886b2bbe24d/File/tasezotiwelisusa.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/16072e9c8527d5---90461543040.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160725a0677b16---38660979258.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/98vubhr77ihio3fapfhe37uggs/jujejuzebasupokoxe.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160741fee73dd8---20423470268.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072fda46e196---xuzudumawit.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/o6ah4sednavioebcvgs0qdcpc3/18208627797.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bcfc243ffb3---1078070900.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/160758087d8700---99932230030.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ccb015c7b---rozoxosakalobovisala.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a7decf1bfbb---momijobunako.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607b57ec9d14f---vamisedimob.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-6-21/20210621040245196308.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160723d23a7c28---befut.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/3544800601.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/7c7ed1ef46dffd37bdac9183977ed895/zuniborumikosebeto.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/c4ddc36e65bded70c4079b0dd087e48e/19896763504.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/r8dici24e5q8uacdinlqp26ci4/99271584287.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/kavlfm5ncgsn5kgi743ovmuq42/82993558370.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/24409518096.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/pixelajeludi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=charlies+central+avePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001a3a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A3A0 10304 bytes
SHA-256: 4b294df2e9f6e719e92a67a1ce71d03740cf9c148737b35cbfeeb4679f95df2a
font_01_sfnt_off0001bad3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BAD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001d2e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D2E5 18016 bytes
SHA-256: 780af512ffc32eac7a10e4d3588ba5e1526e77715a13b427d2f2b9f0e212d966
font_03_sfnt_off00020279.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20279 18100 bytes
SHA-256: 38148df8e59a7f28c6f8d16b9423acd06c34b77bd9388993b284a35c50e8ee0e